Grease gun



Jan. 3, 1939.

E. E. HEWITT 2,142,189"

GREASE GUN f Filed July 17, 1936 3 Sheets-S'net 2 Fig.5

INVENTOR ELLIS E. HEWITT ATTORNEY 1939'. E. E. HEWITT 2,142,189

' GREASE GUN I Filed July 17, 1936 3 Sheets-Sheet 3' fig. 9

INVENTOR ELLIS E- HEWITT v ATTORNEY Patented Jan. 3, 1939 a a a UNITED STATES PATENT oFFrcE- GREASE GUN' Ellis E. Hewitt, Edgewood, Pa., assignor to The p Westinghouse Air Brake Company, Wilmcrding, Pa., a. corporation of Pennsylvania Application July 17, 1936, Serial No. 91,053

a it a a 16 Claims. (01. 221-40 v This invention relates to a grease or lubricant- Other objects of the-invention and features of dispensing device and more particularly to a-denovelty will be apparent from the following device adapted to supply grease or lubricant in scription taken in connection with-the accommeasured or predetermined quantities. panying drawings, in which I .5 I It is an object of this invention to provide a Fig.1 isan elevational view, largely in'section,

grease gun or lubricant supply device adapted of agrease gun embodying my invention, to supply grease 'or semi-fluid lubricant under Fig. 2 is a fragmentary enlarged View of a porpressure'toa lubricant passage. tion of the grease gun shown'in Fig. 1, A further object of the invention is to provide Fig. 3 is a sectional view taken substantially lo an improved grease gun having a reservoirof relalong the line 3-3 "of Fig. 1, with parts broken atively large capacity. and being adapted to sup: away to more clearly disclose other parts, ply lubricant therefrom under relatively high Figs. 4 and 5 are views similar to Fig. 3,-but

pressure. showing the parts in somewhat difierent operat- Another object of the invention is to provide a ing relation, i5 grease gun adapted to supply lubricant in prede- Fig. Sis a perspective view of one of the gears termined, measured quantities. employed in this device,

A further object of the invention is .to provide a Fig. 7 is a sectional view taken substantially f grease gun having a cylinder adapted to contain along the line 1-4 of Fig. 1, a quantity of lubricant, a piston inthe cylinder Fig. 8 is a fragmentary sectionalview of a porfor forcing lubricant therefrom, together with retion of the grease gun shown in Fig. 1, 20

leasable latch or locking means operative to pre- Fig. 9 is a sectional view'taken substantially vent further movement of the pistonafter a pre along the line 9--9 of Fig. 1, and 4 determined amount of movement thereof, where- Fig. 10 is a sectional view taken substantially by the amount of grease or lubricant expelled by along the-line III-l0 of Fig. 1. J 1

the piston is limited. 1 Referring 'tothe drawings, the grease gun pro-- 25 Another object of the invention is to provide a vided by this invention has a cylinder barrel l5, grease gun of the type described-having a manualwhich is secured to a base i6, which may be any" ly operable l'e'verfor effectingv movement'of the suitable construction. and which serves to suppiston, and having a ratchet connecting the lever port the entire assembly and prevent it fromoverwith the piston. turning. i

A further object of the invention is to provide a As shown, the base It comprises a base plate I! grease gun of the type described, and having having a raised central portionpand having semanually' operable means for releasing the latch cured'thereto by suitable means, such as welding," or lockingmeans so as to *permit further movea member l'la to which the cylinder barrel I5 is R5 ment of the piston. attached. The member l'la extends upwards; I Another object of the invention is to-provide from the base plate ll a substantial distance, and a grease gun of the type described and incorpohas formed therein on opposite sides thereof, sub rating means automatically operable on release of stantially semi-circular openings "b; as "is best the latch 'orlocking means, and on further moveshown in -Fig. 1 of the drawings, which are j w ment of the piston, to reset the latch or locking adapted to receive the foot of a workman. 40

means so that it will again operate to, limit move- The cylinder bar-rel i5 is threaded adjacent its 1 ment of the pistonafter a predetermined amount upper end, and has detachably'secured thereon a of movement thereof. head assembly indicated generally by the refer- A further object of the invention is to provide ence numeral I8. The head assembly I8 carries a.

a grease gun of the type described, and in which piston indicated generally by the reference nu- 45 the latch or locking means is arranged to permit meral 20, which is reciprocable in a bore in the free movement of the piston in one directionso cylinder barrel l5..

that the piston may be returned to one end of its The lower end of the cylinder barrel l5 has a range of movement preparatory to refilling of the threaded opening therein. which; is closed by s0 lubricant reservoir. means of a plug 22, while a dischargedv opening Another objectof the invention is to provide 23 communicates with the lower end of'the bore.

a grease gun of the type described which supin the cylinder barrel and has secured therein a. plies grease or lubricant underhigh pressure, but flexible conductor 24. which may be of any suitwhich can be operated readilyeven though the able construction, and which hasat the end therelubricantgisstifi and does not flow freely, of a coupling device 26, which is adapted'to be 55 detachably secured to a fitting 28 secured in an opening in a brake cylinder 38 of a fluid pressure brake equipment, or other piece of apparatus to be lubricated.

The coupling device 26 and the fitting 28 may be of any suitable construction, but I prefer to use the type shown in the drawings. This coupling and fitting are disclosed and claimed in the copending application of C. C.-Farmer, flled July 1'7, 1935, Serial No. 31,758.

The fitting 28 comprises a body having a passage 32 extending therethrough and having a threaded end portion adapted to be secured in a threaded opening in a device to be lubricated. The fitting 28 has a relatively large flange intermediate the ends thereof, and has adjacent the end thereof a smaller flange which is adaptedto be engaged by a member 34 of the coupling 26. The coupling 26 has a cam lever 36 for operating the member 34 to rigidly secure the coupling to the fitting 28 with the passage through the flexible conduit24 in communication with the passage 82 through the fitting 28. l a I The lower end of the bore in the cylinder I has another threaded opening therein which is closed by means of a plug88, while a vent passage I 48 extends through the wall of the cylinder barrel I5 at a point adjacent the upper end thereof.

The head assembly I8 comprises a body 42 having a flange 44 formed thereon, which has its inner face threaded so as to receive the threadedupper end of the cylinder barrel l5, while a gasket- 46 is securedrto the face of the body 42 by means of screws 48, one of which is shown, so as, to be engaged by the end of the cylinder barrel I5.

The body 42 has a bore therein located substantially in axialalignment with the bore in the cylinder barrel I5 when the body 42 is; secured on the cylinder barrel, and a-threaded bushing 58 is mounted in this bore. The bushing Wins a flange 52 thereon which prevents movement of the bushing away from the cylinder barrel I5, while a pin 54 extends through aligned openings in the flange 52 and in the face of the ,body 42 so as to prevent rotation of the bushing-58.

A threaded rod 58 extends through the bore in the bushing 58 andterminates in an enlarged head58, whichis adapted to engage'a-wear resistingsinsert 68 in a member 62 of the piston 28. The member 62 has a threaded boss thereon on which is secured a member 64,. which secures the piston 28 to the end of the rod 56 so as to prevent relative, axial movement therebetween.

The member 64 also serves to} clamp a packing cup66 between the. member 62 and a backing plate 68.

The rod 56 extends through a chamber 18 in the body 42, and has a-key-way 12 cut therein which extends substantially the entire length of the rod. The rod 56 is of such'length as to extend above the body 42 in certain positions of the piston, and the-upper end of the rod 56 is enclosed by a cap I4 which is secured to the body 42.

A bevel gear 16 is mounted on the shaft 56 so as to be movable axially thereof, but is prevented from rotating relative to the shaft 56 by means of a key 18 which extends intothe key-way 12 in the rod 56.:

One face of the gear I6 engages a portion of the body 42, while the other face of the gear 16 is engaged by the end of a tube 88, the other end of which is engaged by the cap 14. The, tube 88 serves to prevent upward movement of the gear 16, and alsoserves to prevent displacement of the key 18.

The teeth on the bevel gear 16 are engaged by teeth on a bevel gear 82, which is rigidly secured on a shaft 84, which is journaled in a bore in a cover plate 86. The shaft 84 extends through the gear 82 and the end thereof is rotatably supported in a bore in a bracket 88 which extends across the chamber 18 in the body 42.

The shaft 84 has a square section, indicated at 85, formed thereon and this section is of somewhat larger. size than the other portions of the shaft. A lever 88 is mounted on the shaft 84 at a point intermediate the square section 85 and the face of the cover 86. The lever 88 is freely roadapted to be gripped by the hand of a workman.

A member 82, having a square opening therein of substantially the same size as the portion 85 of the shaft 84, is mounted on the square portion 85 of the shaft 84. The member 82 is of substantially the same thickness as the square section 85 on the shaft 84 andhas splines, indicated at 83, formed in the periphery thereof, as is best shown in Fig. 2 of the drawings. I

The lever 88 has a cavity formed in the face thereof, and a pawl 84 is positioned in this cavity and is pivotally mounted on a pin 86 carriedby the lever 88. A spring 88 is secured to the lever 88 by a rivet I88, and presses against the pawl 84 so as to hold an end I82 thereof in engagement with the member 82.

The end I82 of the pawl 84 has a face thereon adapted to engage a spline 83 on the member 92 on rotation of the lever 88 in a counterclockwise direction, as viewed in Fig. 2 of the drawings, so that the member 82 will be turned. The end 182 of the pawl ,84 has another face thereon of the lever 88 ina clockwise direction, as viewed in Fig. 2 of the drawings, this face of the pawl 84 will ride over the splines 88 on the member 82,

thereby moving the pawl against the spring 88 and permitting the lever-88 to be turned relative to the member 82. g

A manually operable release plunger I84 is provided,- and, as shown, comprises a. short round shaft having a head formed thereon engaging the pawl 84 on the side of the pin 86 opposite from the point on the pawl engaged by the spring 88. When pressure is applied to the exposed end of the plunger I84, the head thereof presses against the pawl 84 so that the end I82 of the pawl 84 is moved against the spring 88 and out of the .path of movement of the splines 83. on the member 82.

A cover I86 is provided for the cavity in the lever 88, and this cover is held in place by means handle having a square socket therein, so that shaft 84 may be rotated relative to the lever 88, as will hereinafter more fully appear.

The grease gun provided by this invention incorporates means to prevent further movement of the piston 28 after a predetermined amount of movement thereof so that lubricant will be diswhich is angularly disposed so that on movement charged from the gun in predetermined amounts. This means comprises a pin H2, which is secured in a bore ingear 82, and projects therefrom so as to engage the end of an arm I I4 in one position of the arm. The arm I I4 is mounted in the cavity I0 in the body portion 42, and is secured on a short shaft H6, which extends through a bore in the cover 86 and has secured on the other end thereof a lever H8. A spring washer H9 is mounted on the shaft H6 between the lever H8 and the cover 86, and exerts force through the lever H8 and the shaft II 6 to press the arm II4 firmly against the face'of the cover 86 so that considerable friction-is developed between the arm the position in which they are moved.

The face of the gear 82 has-a shoulder I20 formed thereon radially inwardly of the pin I I2, and this shoulder is adapted to be engaged by a portion of the end of the arm H4 to limit movement of the arm in a counterclockwise direction, as viewed in Figs. 3, 4 and 5 of the drawings. This is the latching or looking position of the arm H4. The shoulder I20 on the gear 82, the pin II2 carried thereby, and the shaft H6 on which the arm H4 is mounted, are arranged so. that when the inn'er end of the arm H4 is in engagement,

with the shoulder I20 and the pin H2 presses against the end of the arm H4, the arm H4 and the shaft I I6 are disposed substantially in a plane tangent to a'circle passing through the center of the pin H2 and having its center at the axis of the shaft so that substantially no force is exerted on the arm H4 tending to turn itout of the path of movement of the pin H2.

The arm I I 4 has formed on the free end thereof a boss I I5 which projects therefrom away from the cover 86 a short distance, as is best shown in Fig. 1 of the drawings. The end of the boss H5 is substantially in engagement with the face of the gear 82 while a portion of the boss engages the shoulder I20 on the gear 82.

The cover 86 has a projection I 22 formed thereon and adapted to be engaged by the arm H4 to limit movement of the arm in a clockwise direction, as viewed in Figs. 3 to 5 of the drawings. This is the release position of the arm I I4. The

projection I22 extends from the face of the cover 86 only a short distance so as to be engaged only by the portion of the arm H4 adjacent the cover 86. The projection I22 preferably does not extend in the plane of the boss H5 in the end of the arm H4. The relationship ofthese parts is best shown in Fig. 1 of the drawings.

The gear 82 has formed on the face thereof a projection indicated generally by the reference numeral I24, and this projection extends from the face of the gear 82 a shorter distance than the boss II5 on the end of the arm II4 extends from this arm The projection I24 is symmetrical in shape, and has narrow end portions. I26, which terminate in rounded points which are located radially outwardly of the boss I I5 on the lever I I4 when the lever H4 is in engagement with the projection I22. The mid portion of the projection of the flexible conduit 24 connected thereto when the gun is not in use. This portion of the handle I28 also has forrne therein a. T-slot I34, as is best shown in Fig. 9 of the drawings, which is adapted to receivelthe In order to fill the gun with lubricant, the pis'-- ton 20 is first. moved substantially to the upper end of the bore in the cylinder barrel I5, if it is not already in this position. The'piston 28 may be readily moved to this position by applying pressure to the release plunger I04 carried by the lever 90, to move the end, I02 of the pawl 94 out of engagement with the splines 93 on the member 92.

The shaft 84 may now be turned in a clockwise direction, as viewed in Fig. 2 of the drawings, by a wrench which engages the, facesof the square end portion IIII of the shaft 84. This movement of the shaft 84 causes the gear 82 to turn the gear I6, and rotation of the gear I6 is transmitted through the key 18 to the rod 56 to turn the rod 56 inthe bushing 50 in a direction to cause the rod 56 and piston 20 to move upwardly.

After the piston 20 is moved to the upper end of the bore in the cylinder barrel I 5, the cover assembly I8 is unscrewed from the cylinder barrel l5 and is removed therefrom. The bore in the cylinder barrel may now be filled in a suitable manner with grease, semi-fluid lubricant or other suitable lubricating material. In order to facilitate the filling of the bore in the cylinder barrel, the plug 38 may be removed to provide a passage for the escape of air from the cylinder barrel.

After the bore inthe cylinder barrel is filled with lubricant, the cover assembly replaced, being turned to aposition in which the lever 90 projects from the gun on aside of the base I6 having an opening IIb therein. After the grease or other lubricant has been packed down in the cylinder barrel I5 so as to remove air bubbles therefrom, the plug 38 is replaced. The piston 20 is now forced downwardly in the bore in the cylinder barrel I5 by operating the lever 90.

This lever is alternately pushed downwardlyand lifted up.

In order to hold the gun firmly and prevent it from overturning while the lever 90 is being operated, the operator may place the toe portion of one of his feet in one of the openings I'Ib in the base I6 and press downwardly on the raised central portion of the base plate I1.

On downward movement of the handle portion 9| of the lever 90, the end I02 of the pawl 94 is pressed into engagement with a spline 93 on the member 92 so that the shaft 84 is rotated, thereby turning the gear 82 and causing it to turn the gear I6. On this movement of the gear 16, the rod 56 is rotated in a direction which causes the thread thereon to advance in the thread in the bushing 50 and move the piston .downwardly in the bore in the cylinder barrel I5, thereby, forcing lubricant out through the flexible conduit 24.

On upward movement of the handle portion SI of the lever 90, the angular face on the end I02 of the pawl 94 rides over the splines 93.with the result that the end I02 of the pawl 94moves against the spring 98 and no movement of the member 92 occurs. On subsequent downward movement of the handle. portion 9| of the lever 90, the end I02 of the pawl 94 is again pressed intoengagement with a spline 99 by the spring 98 so that the lever 90 will again turn the shaft 84. 7

After a limited amount of movement of the gear 82, the pin II2'carried thereby will engage the end of the arm II4 to prevent further rota- 1 tion of the gear 82, assuming that thearm II4 is in its latching position, which is the position in whichit is shown in Fig. 3 of the drawings.

A fitting 28 is now secured in a threaded opening in the apparatus to belubricated, such as the brake cylinder 30, and the coupling 26 is then connected to this fitting. The lever I I8 isnext moved in a counterclockwise direction, as viewed in Fig. 2 of the drawings, so as to move the arm I I4 from the latching position into engagement with the stop or projection I22 on the cover 86, which defines the release position ofthe arm H4. The arm H4 is now out of the path of movement of the pin II2 carried by the gear 82 so that the gear 82 may be turned by the lever 90.

The operator now presses downwardly on the handle portion 9i of the lever 90, and the end I02 of the pawl 94 being held by the spring 98 in engagement with a spline 98 on the member 92, the member 92 is turned by the lever 90.

After a short downward movement of-the lever 90, the handle portion of the lever may be lifted upwardly, the pawl 94 permitting relative movement between the lever 90 and the member 92 in this direction, as explained above. The lever 90 may then be moved downwardly again to efi'ect further rotation of the gear 82, and this process may be continued until the desired amount of movement of the gear 82 is secured.

0n rotation of the gear 82, the gear 16 is turned, thereby turning the rod 56 and causing this rod to advance in the threaded bushing 50 so as to force the piston 20 downwardly in the bore in the cylinder barrel I5, thus subjecting the lubricant in the chamber beneath the piston 20 to pressure, and forcing lubricant out through the flexible conduit 24, the coupling 26, and the fitting 29, to thejbrake cylinder 80, or other apparatus to be lubricated. I

On initial movement of the gear 82 subsequent to movement oi the arm I I4 to the release position, the pin H2 carried by the 'gear'82 moves past the arm II4, as is best shown in Fig. 4 of I the drawings.

After a limited amount of rotation of the gear 82, an end I26 of the projection I24 on the gear 82 is moved between the wall of the chamber I0, and the boss II5 on the end of the arm II4, so that orrfurther rotation of the gear 82, the curved inner surface of the projection I 24 engages the boss or projection 'I I5 on the end of the arm H4, and moves the arm in a counter clockwise direction away from the stop I22, as is. best shown in Fig. 5 of the drawings.

When the gear 82 has been turned an amount sufiicient to move the relatively'wide mid-portion of the projection I24 past the boss I I5 on the end of the arm II4; the end of the arm II4 will be moved substantially into engagement with the shoulder I20 on the gear 82, and the end of the arm is again substantially in the path of movement of'the pin H2. The arm H4 is now in its result of this amount of rotation of the gear 82,

the gear I6 andthe rod 56 will be rotated a predetermined amount, and the piston 20 will be moved downwardly in the cylinder barrel I5 a predetermined distance, so that a predetermined quantity of lubricant is forced out through the flexible conduit 24 to the apparatus to be lubricated.

The various parts of the grease gun are proportioned so that the quantity of lubricant discharged from this gun as a result of one revolu-' tion of the gear 82 is substantially the quantity required to properly lubricate a piece of appararelatively light force applied to the end of the lever results in a comparatively greatjforce being exerted on the piston 20, while the piston 20 is of such diameter that a high pressure will be developed-on the lubricant in the cylinder barrel I5 beneath the piston 20. As a result luthe fittingwassecured may be closed by a suitable plug, not shown.

The grease gun may now be transported to another piece of apparatus to be lubricated, the handle I28 providing convenient means to carry the gun. If desired, the coupling 26 may be connected to the dummy fitting I30 carried by the handle I28 so as to prevent injury to the coupling 26 or the flexible conduit 24, while the fitting 28 may be carried in the T-slot I94 in the base of the handle.

When another piece of apparatus is to be lubricated' the fitting 28 is secured in place and the coupling 26 is connected thereto. If the opening through the fitting 28 should be clogged, or if any other opening through which lubricant is intended to flow becomes clogged, the tool I92,

which is carried in the T-slot I34 in the handle I28, may be employed to open the passage,

When the coupling 26 has been connected to the fitting 28, the lever I I8 is turned in a counterclockwise direction, as viewed in Fig. 2 of the drawings, so as to move the arm II4 from the latching or locking position to the release position. The lever 90 is now operated to rotate the gear 92 in the manner explained in detail above so as to force lubricant out through the flexible conduit 24, and the cycle of operation recited above is repeated, further rotation of the gear 82 being stopped by the arm II4 after substantially one revolution thereof.

The cylinder barrel I5 is of such ,size that it holds a quantity of lubricant sufilcient to lubricate a large number of pieces of apparatus to be lubricated.- When the supply of lubricant is exhausted, the piston 20 is returned to the upper end of its range of movement by turning the shaft 84 with a wrench which may grip the faces of the square end portion IIO of the shaft 84,

while thepawl 94 may be held out of operative relation with'the splines 93 on the member 92 by pressure applied to the release plunger I04.

When the shaft 84 and the gear 82 are turned in- 'a-counter-cloc'kwise direction, as viewed in Fig. of the drawings,'the pin H2 carriedby the gear 82 engages-aside face'of the arm H4; and moves the arm substantially into engagement with the projection 122 on the cover 86 and out of the path of movementof'the pin=i |2 so that the pin may move pastthe arm H4 without inter- On further movement of the gear 82, an end I26 off the projection 124 -'is"moved between the wallf'of the chamber and the projection or boss "I I5 on-the endof the arml l4, so' that on continued movement of the gear 82, the curved inner face ot-the'projection I24 engages; the boss 5 on theendo'f the"--arm-l|4,'so that arm I is moved in a-counterclockwisedirection in a manner I similar to that'described above, with the result that the projection I24 will move past the boss onthe arm Il4-withoiitinterference.

on each successivefrevolution"'of'j the gear 82, the arm H4 i'smoved outwardly by the-pin H2, while the projection I24 movespast the boss H5 on this arm and "movesthe arm inwardly as described above. "Afterthe-piston zohas returned 1 substantially tothe "upper' -en'd or its rangeor movement, the head as'senjbl-y' I8 is removed from the cylinder barrel l 'ian'd thes'upply of lubricant maybe-replenished; r

' From the foregoing it will be seen F that this grease gun' provides meansi'to deliver lubricant under pressure in measured quantities, and that it incorporates locking means automatically o'perable after a'predetermined amount of movement of the piston' "of-the device to prevent 'further movement of the piston until the operator releases] the locking means' v v It will be seen also that upon release of the locking'meana-and uponfurther operation of the,

grease gun to supplylubricanhthe locking means is automatically reset'so as to prevent movement ofthe-piston'after a predetermined amount of movement thereof, and thereby cut off the supply of lubricant aftera predetermined quantity has beensupplied. w

' It will be seen further that this greasegun incorporates means by which the piston may be quickly returned to the upper end of the range or m'ovementand thatthe locking means is arranged so as not to interfere with this movement ofthe piston. a

In additionit will be seen' that the greasegun provided by this inventionis of simple and rugged construction, and that it provides meansto supply lubricant under suilicient pressure to force "the lubricant" through the lubricant passages the apparatus to be lubricated;

Whileoneembodiment of the improved grease "gunprovided by this'invention has been illustrated'and described in detail, it should be understood that the invention'is not limited to these details j 'ofconstruction, and that numerous changes and modifications maybe made without "departing'from the scope of the following claims.

claim as newjand desire to secure by Letters Having'nowdescribed my'lnvention, what I Patent, is: I

l-.-' In a lubricating device, in combination, a cylinder adapted to contain a quantity of lubricant,a'piston movable in said-cylinder, manually operable means forv effecting movement of the piston in the -'cylinder," a latch'movable between 'alatching position and a-releaseposition, means associated with the piston and engageable with said latch on predetermined movements of the piston in a direction to expel lubricant from said; cylinder when the latch is in the latching position to prevent" further -movement of the piston, :manually operable means for moving the latch from the latching position to the release position to permit further movement of the piston, and means operable-on further movementof thepiston 'for moving the latchafrom'the release position vto the latchingposition. I

2. In a' lubricating device, in combination; a

cylinder adapted to contain a quantity of lubricant, a piston movable in said cylinder, a rotatable member for efiecting movement of th'episton in said cylinder, a latch movable between a latching position and arelease position, means rotatable with said rotatable member and engageable with said latch when thelatchcis in the latching position on each revolutionsjof the rotatable member for preventing ;further movement of the-piston after a predetermined amount of ';movement thereof, and manual'meansfor moving-the latch fromthe latching position to the releaseposition to permit further rotation of said rotatable mem-- ber..' H I I v 3. In t a lubricating j-device, in j combination, a cylinder adapted to' contain a quantity of ,lubricant, a piston movable :in said cylinder, atrotatable-member. for effecting movement of the piston in said cylinder, a latch movable between a latch ing position and a release position, means associated with-said rotatable member and engageable with said latch when the latch is-in the latch member for preventing further movement of the piston after a predetermined amount of'movement'thereof, manual means for moving the latch from the latching position to the release position to permit further rotation of said rotatable member, and means-carried by said rotatable member and operable on further rotation ,of the rotatable member for moving thelatch from the release position to the latching position.

4. In a lubricating device, in combination, a cylinder adapted to contain a quantity of lubricant, a piston movable in said. cylinder, arotatable member for efiecting movement of the piston insaidu cylinder, a latch movable between. a --latching position and a release position, means associated with said rotatable member and engageable with said latch whenthe latch is in the latching position on each revolution of the rotatable member for preventing further movement ofv the piston after a predetermined amount of movement thereof, manual means for moving the latch from the latching position to the release position to permit further rotation of rotatable member, and a cam segment carried by said rotatable member and operable on further rotation of said rotatable, member to move the latch from the, release'position to the latching position.

5; In a lubricating device, in combination,,a cylinder adapted to contain a quantity of lubricant, a piston movable in said cylinder, a rotatable member for efiectingmovement of the piston in said cylinder, a lever associated with said rotatable member, ratchet means associated with said ing position on each revolutiontof therotatable means operable upon a rotative movementoisaid member ior moving said latch into said position.

'7. Ina lubricating device,-a cylinder, a piston movable in saidcylinder to expel lubricant there.- irom,a rotatable member for moving said piston and being operable on a plurality'oi revolutions to move the pistonthroughout itsrange otmovement, a latchflmovable between a latching position and a release position, means rotatable with said rotatable member and engageable with said latch on eachrevolution of the rotatable member to prevent further movement of the rotatable member and of the piston, and means 'Iormoving the latch from the latching position to the release position to permit furthermovement of said rotatable member .andoi saidpiston. l

8; In a lubricating device, a cylinder, a piston movable in said cylinder to expel lubricant therefrom, a rotatable member for moving said piston and being operable on a plurality of revolutions to move the piston throughout its range of movement, a'latch movable between a latching position and a release position, means associated with said rotatable member and engageable with said latch' 'on each. revolution of the rotatable member to prevent further movement of the rotatable member and of the piston, .means for movingthe latch iromthe latching positionto the release position to permit further movement of said-rotatable member and of said piston,and means operable on-iurthermovement of the rotatable member to move the latch from the release position to the latching position." I

'9. In a lubricating device, a cylinder, a piston movable in one direction in said cylinder to expel lubricanttherefrom, a rotatable member or moving said piston and being operable on a pinrality of revolutions in a given direction to move the piston in said'one direction throughout its range of movement, a late movablebetween' a latching position and a release position, means associated with said rotatable member and ongageable with said latch on each revolution of the rotatable member in said given directionwto prevent further movement of the rotatable member in said direction, means for moving the latch from the latching position to the release position to permit iurtheri rotation of the rotatable member, and means associated withthe rotatable member and operable on further rotationthereof in said givendirectionto move the latch from the release position -to the latching-position, the latch and the means associated with the rotatable member being arranged to permit free movement of the rotatable member in theopposite direction. a r

10. In a lubricating device, in combination,-*a

cylinder adapted to contain a quantity of lubricant, a piston movable in said cylinder, manually operable means for efiectingmovement: oi the piston in the cylinder, a latch movable-between a latching position and arelease position, means yieldingly opposing movement of the latch away from either of its positions, means associated with the-piston'and engageable with'said latchon predetermined movements of the piston a a direction to mesa cylinder when the latch is in the, latching position to prevent further movementroi thepiston. man- :position to' the latching position.

111. In;a--,lnbricating device, in combination, a cylinder adapted to contain a quantity 0! lubricant. a piston mounted in said cylinder and:op I

arable-on movement in one direction to expel lubricantthereirom, 'means (or electing movement oi, said piston in said one direction, an elementmovablelnaccordance with said piston. and aiatchpmember associated with said cyiinder and repeatedlycooperating with said element durinsa movement or the pistonthroughout its range of, movement in said one direction to repeatedly, arrest :iurthermovement o1 said 12.--In ;a lubricating device, 'in combination, a

cylinder adapted to contain a quantity of lubricant, .a :piston mounted. in said cylinder and operable ,on movement therein in. one direction to expel y, lubricant therefrom, means for effecting movement of said piston in said one direction, an

element movable inaccordance with said piston.

alatchmember associated with said cylinder for engaginssaid elementto prevent further move- 'ment of the; piston upon movement of the piston to one positiomand also engageable with said element to. preventiurther movement of said piston upon movement oi said piston to another position. i v13. In a lubricating device, in combination. a cylinder-adapted; to contain a quantity of lubricant, a; piston mountedimsaid cylinder and operable-Hon movement therein in one direction to 'expeLlubricant therefrom. means for eflecting movementroi said piston in said one direction. an element movable in accordance with said picten, a latch member associated with said cylinder and engageable with said element, on movement moi thepistoninsaid one direction to one position to preventiurther movement of said piston. and also engageable withsaid element to pr'eventiurther movement of said piston upon movement of said piston to another position, and means (or moving said latch member out, 01 the path of movement of said element to permit iurther ,movement ,of saldpiston. a

- 1 14. In alubricatingjevice, incombination, a cylinder adapted to contains quantity oi lubricant, a piston mountedin said cylinder and op- -;erable on movementtherein in one direction to ,expel lubricantthereirom, means for cheating movementoi. said piston in said one direction. an

element movable in accordance with said'piston. an d alatohgmember associated with said cylinder and repeatedly-,cooperatins with said element aiterpredetermined movements of said piston throughout its range of. movement in said one dlrection to prevent 'iurther movement oi said piston.

15, Ina lubricating device, incombination, a

cylinder adapted to contain a quantity of lubricant, apiston mounted in-said cylinder and operable onmovementtherein inone direction to expel lubricant; therefrom, means for eflecting movement oi-saidpiston in said onedirection. an elementmovable in accordance with said piston. a latch member'associated with said cylinder and repeatedly cooperating with said element alter predetermined movements of said piston,

throughout :itsrange ot'movement in said one direction to prevent :further movement or said piston, and means ion-moving said latch member out of the path -.oi.rnovement of said element to I permit further movement of said piston.

16. In .a lubricating device, in -:combination, a cylinder adapted to contain a quantity of lubricant, apiston mounted in said-cylinder and operable on movement therein in one :direction to expel lubricant therefrom, means -i'or :eiifecting movement of said piston in said oneidirection',

an element movable in accordance wlth'said piston, a latch member .associated with said cylinder further movementof said piston upon movement of said piston to another position, means for moving said latch member out of the path of movement of said element to permit further movement of said piston, and other means movable in accordance with said piston and operative on further movement on said piston to move the latch member into the path of movement of said element. 

